All Questions
Tagged with low-battery battery-operated
19
questions
6
votes
5
answers
2k
views
Best way to halve 12V battery voltage for 6V device, while still being able to measure the battery level?
I have a device that is powered by 4 AA (4x1.5V=6V) batteries, but I want to power it with a 12V battery.
The device measures its input voltage to determine the battery level. I only need to know if ...
- 377
-1
votes
2
answers
326
views
When is it time to change out batteries in multimeters?
On my multimeter, the D.C. voltage readings get inaccurate over time due to battery discharge.
How can I tell when to change out the batteries?
By consulting the manuals, I found what is displayed ...
- 209
3
votes
2
answers
390
views
Why does this lithium battery have such a flat discharge curve?
I'm trying to understand some apparently anomalous observations of the discharge profile of a 1S lithium battery. I'm using this battery to run a Raspberry Pi Zero W, back-powering the Pi via the +5V ...
- 133
1
vote
1
answer
1k
views
Li-ion vs Li-Po batteries cut-off protection
I am confused with the differences between Li-ion batteries (like 18650) and Li-Po (the flat ones).
I know that basically they are both lithium ion, but when I want to buy I see that LiPos have always ...
- 11
0
votes
1
answer
374
views
How to use LBO on Powerboost 1000C as input for Arduino
I am using a project which uses an Arduino Uno and a powerboost 1000C. in the manual it says,
LBO - not a leveraged buy out! this is the Low Battery Output. By default it is pulled high to BAT but ...
- 258
0
votes
1
answer
76
views
How to prevent circuit from shutting down when motor drain too much power
I have a device which has motor and circuits with PLC. This device is connected to a 12v battery which is powering the PLC and motor. Everything is working fine but when the motor's load is heavy, it ...
- 11
2
votes
3
answers
669
views
Real thing or just misinterpretation? Rotating batteries to make TV remote work
When TV remote isn't working, I rotate the batteries in the remote in their place and it begins to work. I don't see any kind of deposit between the batteries and the contacts. Rotation of battery ...
- 23
9
votes
10
answers
6k
views
Would a 7805 5 V regulator drain a 9 V battery?
Doing some DIY as a hobby, I'm making a small humidity-temperature radio sensor.
An ATmega328 is reading from a DHT11 sensor and then transmitting data to a Raspberry Pi by an STX882 radio ...
- 323
3
votes
0
answers
106
views
Ultra low power battery
I am currently in the middle of a project and I am quite unsure of what type of battery and battery charger I should be using. To be honest I have never worked with battery or battery charger yet.
In ...
1
vote
1
answer
86
views
Calculate battery duration [duplicate]
Maybe this is a trivial question, but I am struggling with it for a while.
I have an alkaline AA battery which is consuming 80mA for 8 seconds each 30 minutes. I need to calculate how many days it ...
- 173
-1
votes
1
answer
485
views
9v battery voltage goes down very low when connected, but shoots back up when it is disconnected?
Whenever I leave a 9v battery connected to my circuit (simple circuit connected to a motion sensor) It goes down to about 3.3v, but when I disconnect it again, it will slowly go back up to about 8v. ...
0
votes
1
answer
687
views
ON/OFF push button circuit with battery under voltage protection
I have put together the push button circuit explained in TI's SCEA048B application report with an under voltage protection using TI's LMS33460 chip. I ended up with the circuit attached.
The idea is ...
- 229
0
votes
0
answers
45
views
Batteries have spare capacity when unused for minutes after running out? [duplicate]
I tested it with NiZN batteries:
After they ran out of power, I measured their voltage. 0.9V.
I waited 15 minutes, measured again without charging, and it was at 1.5V.
I continued operating a CD ...
- 752
0
votes
2
answers
348
views
Controlling a LDO with voltage detector
For one of my project I need to shutdown my system when my Li-ion battery reaches 3V.But I want to know if I can use this type of component : http://www.farnell.com/datasheets/11601.pdfhttp://www....
- 453
1
vote
3
answers
4k
views
Batteries and running time
If I have a system working at 2.5V-0.3mA powered by two CR123 3.7V-2000mAh.Is my system going to last the same time if I put my batteries in parallel or in series?Because if I want it to last 12hrs a ...
- 453